F28335 ADC SOCA XINT2

Hi Charlie,

I don't think we have an example that does exactly that but we have a couple under controlSUITE\device_support\f2833x\v###\DSP2833x_examples_ccsv5\ that should give you the pieces you need to figure it out:

external_interrupt demonstrates selecting a GPIO for use as the XINT2 input and selecting what kind of pin event triggers the XINT. It also sets up the ISR for the XINT.

adc_soc shows configuration of the ADC to use EPWM1 to generate the SOC, but it should be pretty similar to what you need to do to use XINT2 instead. It also sets up an ADC ISR.

Take a look at those examples, and let me know if you still have questions.

Whitney

Hi Whitney,

Thanks for the information.

One question, in the PieVectTable setup for the interrupt initialization, should I use ADCINT or XINT2 to initialize ISR function?

In other word, which line below should be used:

PieVectTable.ADCINT = &adc_Isr;

OR

PieVectTable.XINT2 = &adc_Isr;


Charlie

Charlie,

It depends what you want to do in the interrupt. If you want to get the interrupt to inform you that the ADC conversion has finished, you'll want to use the ADCINT.

Whitney

Yes, that's exactly what I'm trying to do - getting an interrupt at the end of ADC conversion.

Now, do I need to use both XINT2 and ADCINT or just ADCINT?

In the External Interrupt example:

PieVectTable.XINT2 = &xint2_isr;

In the ADC_SOC example:

PieVectTable.ADCINT = &adc_isr;

Do I need both ISRs?

If you don't need to do anything in the XINT2 ISR (and it sounds like you don't), you don't need to register it in the vector table or enable the interrupt. It sounds like you can just use ADCINT.

Whitney

Great, it works now! Thanks for your help.